A constant buzzing vibration in the drive line occurred instantly at approximately 30K miles. Drive shaft has been replaced but that only changed the speed at which the vibration comes in.

rode in the vehicle last Saturday with a service manager and his little box. The box kept reading "driveline", confirming that it is not the tires or someother trivial issue.

Guess I will put "Lemon" signs on it since ford does not want to respond.

just bought this truck brand new a month ago has a vibration at about 67 mph also has a humming noise coming from rear end when in 4x4 also a couple of times came to a stop and thought someone had hit me in the rear not sure whats going on with that wish i had never bought this truck now with so many problems already

There is a vibration in the transfer case. I tried telling the dealership but no one wants to listen very fustrating.

well the transfer case whistles the transfer case clanks i have a real vibration that shakes the steering wheel and the gas pedal between 75km and 85km very annoying and loud